This isn't the first bustage I've seen like this in the past 1-2 weeks. Some sort of IPDL issue it appears. https://tbpl.mozilla.org/php/getParsedLog.php?id=48334136&tree=Mozilla-Inbound 18:31:02 INFO - A protocol named PFileDescriptorSet exists in multiple namespaces 18:31:02 INFO - make -C /builds/slave/b2g_m-in_emu-d_nu-000000000000/build/gecko/security/nss/lib/nss/../libpkix/pkix_pl_nss/module private_export CC=' /usr/bin/ccache /builds/slave/b2g_m-in_emu-d_nu-000000000000/build/prebuilt/linux-x86/toolchain/arm-linux-androideabi-4.4.x/bin/arm-linux-androideabi-gcc' SOURCE_MD_DIR=/builds/slave/b2g_m-in_emu-d_nu-000000000000/build/objdir-gecko/dist SOURCE_MDHEADERS_DIR=/builds/slave/b2g_m-in_emu-d_nu-000000000000/build/objdir-gecko/dist/include/nspr DIST=/builds/slave/b2g_m-in_emu-d_nu-000000000000/build/objdir-gecko/dist NSPR_INCLUDE_DIR=/builds/slave/b2g_m-in_emu-d_nu-000000000000/build/objdir-gecko/dist/include/nspr NSPR_LIB_DIR=/builds/slave/b2g_m-in_emu-d_nu-000000000000/build/objdir-gecko/dist/lib MOZILLA_CLIENT=1 NO_MDUPDATE=1 NSS_ENABLE_ECC=1 SQLITE_LIB_NAME=nss3 SQLITE_INCLUDE_DIR=/builds/slave/b2g_m-in_emu-d_nu-000000000000/build/objdir-gecko/dist/include NSS_DISABLE_DBM=1 topsrcdir='/builds/slave/b2g_m-in_emu-d_nu-000000000000/build/gecko' BUILD='/builds/slave/b2g_m-in_emu-d_nu-000000000000/build/objdir-gecko/security/$(subst $(topsrcdir)/security/,,$(CURDIR))' BUILD_TREE='$(BUILD)' OBJDIR='$(BUILD)' DEPENDENCIES='$(BUILD)/.deps' SINGLE_SHLIB_DIR='$(BUILD)' SOURCE_XP_DIR=/builds/slave/b2g_m-in_emu-d_nu-000000000000/build/objdir-gecko/dist NS_USE_GCC=1 NSS_ENABLE_ZLIB= PROGRAMS= CHECKLOC= NATIVE_CC='cc' CC=' /usr/bin/ccache /builds/slave/b2g_m-in_emu-d_nu-000000000000/build/prebuilt/linux-x86/toolchain/arm-linux-androideabi-4.4.x/bin/arm-linux-androideabi-gcc' CCC=' /usr/bin/ccache /builds/slave/b2g_m-in_emu-d_nu-000000000000/build/prebuilt/linux-x86/toolchain/arm-linux-androideabi-4.4.x/bin/arm-linux-androideabi-g++' LINK='/builds/slave/b2g_m-in_emu-d_nu-000000000000/build/prebuilt/linux-x86/toolchain/arm-linux-androideabi-4.4.x/bin/arm-linux-androideabi-ld' AS=' /usr/bin/ccache /builds/slave/b2g_m-in_emu-d_nu-000000000000/build/prebuilt/linux-x86/toolchain/arm-linux-androideabi-4.4.x/bin/arm-linux-androideabi-gcc' AR='/builds/slave/b2g_m-in_emu-d_nu-000000000000/build/prebuilt/linux-x86/toolchain/arm-linux-androideabi-4.4.x/bin/arm-linux-androideabi-ar crs $@' RANLIB='/builds/slave/b2g_m-in_emu-d_nu-000000000000/build/prebuilt/linux-x86/toolchain/arm-linux-androideabi-4.4.x/bin/arm-linux-androideabi-ranlib' RC=' ' OS_ARCH='Linux' OS_TEST='arm' CPU_ARCH='arm' OS_RELEASE='2.6' OS_PTHREAD= ARCHFLAG='-DANDROID -isystem /builds/slave/b2g_m-in_emu-d_nu-000000000000/build/bionic/libc/arch-arm/include -isystem /builds/slave/b2g_m-in_emu-d_nu-000000000000/build/bionic/libc/include/ -isystem /builds/slave/b2g_m-in_emu-d_nu-000000000000/build/bionic/libc/kernel/common -isystem /builds/slave/b2g_m-in_emu-d_nu-000000000000/build/bionic/libc/kernel/arch-arm -isystem /builds/slave/b2g_m-in_emu-d_nu-000000000000/build/bionic/libm/include -I/builds/slave/b2g_m-in_emu-d_nu-000000000000/build/system -I/builds/slave/b2g_m-in_emu-d_nu-000000000000/build/system/core/include -isystem /builds/slave/b2g_m-in_emu-d_nu-000000000000/build/bionic -I/builds/slave/b2g_m-in_emu-d_nu-000000000000/build/hardware/libhardware/include -I/builds/slave/b2g_m-in_emu-d_nu-000000000000/build/external/valgrind/fxos-include -I/builds/slave/b2g_m-in_emu-d_nu-000000000000/build/frameworks/base/opengl/include -I/builds/slave/b2g_m-in_emu-d_nu-000000000000/build/frameworks/base/native/include -I/builds/slave/b2g_m-in_emu-d_nu-000000000000/build/frameworks/base/include -I/builds/slave/b2g_m-in_emu-d_nu-000000000000/build/frameworks/base/services/camera -I/builds/slave/b2g_m-in_emu-d_nu-000000000000/build/frameworks/base/include/media/ -I/builds/slave/b2g_m-in_emu-d_nu-000000000000/build/frameworks/base/include/media/stagefright -I/builds/slave/b2g_m-in_emu-d_nu-000000000000/build/frameworks/base/include/media/stagefright/openmax -I/builds/slave/b2g_m-in_emu-d_nu-000000000000/build/frameworks/base/media/libstagefright/rtsp -I/builds/slave/b2g_m-in_emu-d_nu-000000000000/build/frameworks/base/media/libstagefright/include -I/builds/slave/b2g_m-in_emu-d_nu-000000000000/build/external/dbus -I/builds/slave/b2g_m-in_emu-d_nu-000000000000/build/external/bluetooth/bluez/lib -I/builds/slave/b2g_m-in_emu-d_nu-000000000000/build/dalvik/libnativehelper/include/nativehelper -Wall -Wpointer-arith -Wdeclaration-after-statement -Werror=return-type -Werror=int-to-pointer-cast -Wtype-limits -Wempty-body -Wsign-compare -Wno-unused -mandroid -fno-short-enums -fno-exceptions -march=armv7-a -mthumb -mfpu=vfp -mfloat-abi=softfp -std=gnu99 -fgnu89-inline -fno-strict-aliasing -ffunction-sections -fdata-sections -fno-math-errno -pipe -DDEBUG -DTRACING -g -freorder-blocks -Os -fno-reorder-functions -funwind-tables -DCHECK_FORK_GETPID -DRTLD_NOLOAD=0 -include /builds/slave/b2g_m-in_emu-d_nu-000000000000/build/gecko/security/manager/android_stub.h' LDFLAGS='-mandroid -L/builds/slave/b2g_m-in_emu-d_nu-000000000000/build/out/target/product/generic/obj/lib -Wl,-rpath-link=/builds/slave/b2g_m-in_emu-d_nu-000000000000/build/out/target/product/generic/obj/lib --sysroot=/builds/slave/b2g_m-in_emu-d_nu-000000000000/build/out/target/product/generic/obj/ -mthumb -Wl,-z,noexecstack -Wl,-z,text -Wl,--build-id -Wl,--icf=safe -Wl,-rpath-link,/builds/slave/b2g_m-in_emu-d_nu-000000000000/build/objdir-gecko/dist/bin -Wl,-rpath-link,/usr/local/lib -L/builds/slave/b2g_m-in_emu-d_nu-000000000000/build/objdir-gecko/dist/lib -lmozglue -Wl,--wrap=PR_GetEnv,--wrap=PR_SetEnv -Wl,--wrap=pthread_create,--wrap=epoll_wait,--wrap=poll,--wrap=pthread_cond_timedwait,--wrap=__pthread_cond_timedwait,--wrap=pthread_cond_wait,--wrap=epoll_create,--wrap=epoll_ctl,--wrap=close,--wrap=pthread_key_create,--wrap=pthread_key_delete,--wrap=socketpair,--wrap=pthread_self,--wrap=pthread_mutex_lock,--wrap=pthread_join,--wrap=pipe,--wrap=pipe2,--wrap=tgkill' DSO_LDOPTS='-shared -Wl,-z,defs -Wl,--gc-sections -mandroid -L/builds/slave/b2g_m-in_emu-d_nu-000000000000/build/out/target/product/generic/obj/lib -Wl,-rpath-link=/builds/slave/b2g_m-in_emu-d_nu-000000000000/build/out/target/product/generic/obj/lib --sysroot=/builds/slave/b2g_m-in_emu-d_nu-000000000000/build/out/target/product/generic/obj/ -mthumb -Wl,-z,noexecstack -Wl,-z,text -Wl,--build-id -Wl,--icf=safe -Wl,-rpath-link,/builds/slave/b2g_m-in_emu-d_nu-000000000000/build/objdir-gecko/dist/bin -Wl,-rpath-link,/usr/local/lib -L/builds/slave/b2g_m-in_emu-d_nu-000000000000/build/objdir-gecko/dist/lib -lmozglue -Wl,--wrap=PR_GetEnv,--wrap=PR_SetEnv -Wl,--wrap=pthread_create,--wrap=epoll_wait,--wrap=poll,--wrap=pthread_cond_timedwait,--wrap=__pthread_cond_timedwait,--wrap=pthread_cond_wait,--wrap=epoll_create,--wrap=epoll_ctl,--wrap=close,--wrap=pthread_key_create,--wrap=pthread_key_delete,--wrap=socketpair,--wrap=pthread_self,--wrap=pthread_mutex_lock,--wrap=pthread_join,--wrap=pipe,--wrap=pipe2,--wrap=tgkill' FREEBL_NO_DEPEND=0 NSS_NO_PKCS11_BYPASS=1 PUBLIC_EXPORT_DIR='/builds/slave/b2g_m-in_emu-d_nu-000000000000/build/objdir-gecko/dist/include/$(MODULE)' SOURCE_XPHEADERS_DIR='$(SOURCE_XP_DIR)/include/$(MODULE)' MODULE_INCLUDES='$(addprefix -I$(SOURCE_XP_DIR)/include/,$(REQUIRES))' MAKE_OBJDIR='$(INSTALL) -D $(OBJDIR)' TARGETS='$(LIBRARY) $(SHARED_LIBRARY) $(PROGRAM)' NSINSTALL='/builds/slave/b2g_m-in_emu-d_nu-000000000000/build/objdir-gecko/config/nsinstall' 18:31:02 ERROR - make[6]: *** [export] Error 1 18:31:02 INFO - make[6]: Leaving directory `/builds/slave/b2g_m-in_emu-d_nu-000000000000/build/objdir-gecko/ipc/ipdl' 18:31:02 ERROR - make[5]: *** [ipc/ipdl/export] Error 2

Another example from the backout of bug 1063304. https://tbpl.mozilla.org/php/getParsedLog.php?id=48302583&tree=Mozilla-Inbound

Bug 994190 is fixed.

Reopend as per bug 1114669 comment 2.